There are plenty of digital thermometer schematics out-there but as i said in an earlier post, its nice to have where to chose from. Being based on a tutorial about Analog to Digital conversion, it is very easy to understand the functioning of the device, and you can build it with any micro controller even if it doesn’t have a builtin ADC.
The temperature sensor used in this project is thermistor which is very suitable for measuring ambient atmospheric temperatures, but you could replace it with any other type of temperature sensor, that would function in a range that is more adequate to your application.
Digital Thermometer: [Link] - [Via]
This project is a simple 12-bit, 8-channel analog to digital converter (with 4 additional digital inputs), which may be connected to the PC through the serial interface (RS232). The sequence of sampled channels, and sampling frequence are programmed by the PC while the maximal sampling frequency is limited by the data transmission rate, and at 115200 baud is equal to ca. 3kHz for 1 channel without digital inputs, and to ca. 500 Hz for 8 channel with digital inputs.
The analog input voltage range is -2.5V to 2.5V. The digital inputs may be used for recording additional digital signals, eg. the time code used to synchronize the recorded data with other events. The project is based on PIC16F84 (or 166C84) microcontroller, and MAX190 (or MAX191) ADC. The device is mounted on a small single-sided printed circuit board, easy to prepare even at home.
PIC16F84 12-bit, 8-channel analog to digital converter: [Link]
The first order of business is to open the camera-end of the Nikon-supplied camera-to-USB cable. The outer plastic shell (cover) of the connector is separate from the inner connector and wire so it is possible to cut open the cover by carefully slicing along one side. (see the picture at the top of this page)
Once the slice is complete, the outer plastic cover can be removed revealing what appears to be injected plastic covering the wires and the solder tags of the connector. This inner plastic layer has to be carefully removed.
How to make a dual USB and serial cable from the Nikon Coolpix E990 USB cable: [Via] - [Link]
the author writes: The idea for this hack came from articles circling the internet about a homemade cable that allows you to transfer data from your “one time use” CVS Digital Camcorder to computer, effectively making it a fully functional digital camcorder. Well, I decided to take a step further for a couple of reasons. One, I didn’t own or have access to a Palm m100 or Palm III cable (and no store in town sells the outdated cables) that I could hack apart. Two, I didn’t want to have to lug a butchered cable around with me if I wanted to connect my camera to my laptop or another computer. So, I decided to add a USB port to my CVS Cam.
CVS One Time Use Camcorder Hack: [Via] - [Link]
The Squarecave is a hybrid digital and analog music synthesizer. It uses digital CMOS ICs to generate a sequence of oscillations of varying pitch and volume, and then pipes the result through analog filters (lo-pass, hi-pass, band-pass).
Squarecave: DIY analog/digital synthesizer: [Link]